Mafia in the Underworld? {Mafiatale Undertale FanFic} (Sans x OC)

-10-

We had all gone to bed again, Jade sleeping in her dad's room. Sans had to read Papyrus a bedtime story and slept in his room, since he was a bit angry again. I decided that he shouldn't go out with me if Zoey is going to be around.

I tossed and turned sleeplessly. I kept tossing and turning, trying to get comfortable without Sans arms around me.

Soon, I fell into the nightmares grasp after being away from it for so long...

It was the judgement hall, before the kings throne room. Sans stood in front of me, and Papyrus wasn't there. My body moved without will up to Sans.
"It's a beautiful day outside, birds are singing, flowers are blooming, and kids like you, should be BURNING IN HELL," he said, throwing bones and lasers at me as one eye disappeared, the other flashing blue and orange. My body dodged them and I realized I had a knife in my hand. I couldn't scream, I couldn't shout, I couldn't stop myself as my body and Sans as they danced with the devil. My SOUL was dark blue as he tossed me into walls and pillars, the actual pain shooting through my body, though I couldn't scream. I saw my own lips curl into a wicked smile, my eyes glowed red.

They tangoed, and I saw myself die and come back, attacking again. Sans dodged all of my attacks and it made me happy he did. I would rather die a million times more than watch him get hurt, but sadly, my wish wasn't granted as he did his special attack, but fell asleep. I screamed in my head for him to wake up. I saw my body walk up to him, slash at him. He woke up and dodged, chuckling. My heart swelled with relief, only to shatter when he was sliced, bleeding. My heart stopped as he walked off and his SOUL shattered. My body was grinning evilly, eyes gleaming madly as new blood coated the knife.

I woke up, tears streaming down my face as my body shook with loud sobs. I held myself close, still feeling the pain of every broken limb I got, every bone that pierced me, and worse of all, the pain of seeing Sans die by MY hands. I heard my door open and I looked up, seeing Sans. He looked worried. I backed up. No no no... I'll hurt him... I'll kill him... he walked over to me and fear set in, I jumped out of bed, staying far away.
"D-dont... I'll... I'll hurt you... it happened before... I won't let it happen again..."  I sobbed out, shaking. Realization dawned in his eyes.
"Kitten, it's okay... that was a different timeline... let me explain, just come here," he said, walking closer. I backed up into the wall, sobbing louder. He grabbed my hand, pulling me close, hugging me. I cried hard into his shoulder as he picked me up, cradling me, letting me cry it out. Once I was done, he made me explain the nightmare.
"W-we were in the judgement hall again, before the throne room. Papyrus wasn't there like last time. I-I wasn't myself... I was a monster... we started fighting and my SOUL turned blue, and I was thrown into the walls until I was so broken before you killed me with bones. I was back there. We continued this fight, until you didn't make a move, making it your turn the whole time, but you fell asleep. My body walked up to you, slashing down. You dodged but I slashed again and your SOUL shattered in front of me... you died by my hand... I didn't even look like myself... my eyes were red.... I terrified myself," I said, tears pouring down again, but no sound of sobs escaped.
"Let me explain... Chara was the first human to fall down to the UNDERGROUND, the kings son took the child in. She ended up dying of an illness. The kings son took her SOUL, absorbing it to cross the barrier with her body, laying her on golden flowers which was her last wish. But, the villagers thought he killed her, and he ended up dying once he got back home. Chara is now a spirit who possess humans that fall down, tries to control their body and kill everything. The fight you saw, that was in another timeline, where you were possessed and killed everyone, including me," he said quietly. I looked down. Even if it was from a different timeline, guilt and shame burned a whole through me. I felt like it was my fault, that the me from a different timeline was possessed and killing everyone. Seeing Sans die... it haunted my thoughts.